Re: [libvirt] [PATCH 1/2] conf: add debugcon-isa chardev guest interface
On Fri, 2019-01-25 at 14:06 +0000, Nikolay Shirokovskiy wrote:
On 25.01.2019 16:37, Ján Tomko wrote:
> On Thu, Jan 24, 2019 at 05:28:59PM +0300, Nikolay Shirokovskiy wrote:
> > This interface can be used for example by firmware to print
> > debug messages. Here is domain xml example:
> >
> > <channel type='file'>
> > <source path='/var/log/libvirt/qemu/VM.firmware.log'/>
> > <target type='debugcon-isa'/>
>
> IMO 'debugcon' would be enough.
I followed serial chardev xml. It uses pci-serial, usb-serial etc
for target type. I think idea is to make it possible to specify
type when address is not specified (if it is then one can use
address type to distinguish). Of course we have only isa-debugcon
device yet. However I agree that for channel configuration having
enumeration like spicevm, guesfw, debugcon-isa looks like mixing
types and subtypes.
Should this be a <channel> at all?
We generally use <serial> for native emulated devices such as
isa-serial, which isa-debugcon seems very closely related to...
Perhaps the best way to hook this up would be
<serial type='pty'>
<target type='isa-serial'>
<model name='isa-debugcon'/>
</target>
</serial>
CC'ing Pavel as we looked into this mess together the last time
around, so he might have an opinion on the subject :)
--
Andrea Bolognani / Red Hat / Virtualization